Federation module with handshake protocol, trust tiers (trusted/peer/
monitored), X25519 key exchange + ChaCha20-Poly1305 encryption, and
Redis store-and-forward relay (7-day TTL). Federation API: handshake,
approve/reject peers, trust tier management, pending event counts.
D3.js force-directed knowledge graph at /graph with entity-type shapes
and colors, drag/zoom, click-to-inspect, and type filtering.
Root endpoint at / with API info. Two new MCP tools for federation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>